IAudioClient::Initialize方法的未解析外部符号.API公司

Unresolved External Symbol for IAudioClient::Initialize method. WASAPI API

本文关键字：外部 符号 公司 API Initialize 方法 IAudioClient      更新时间：2023-10-16

我正试图通过WASAPI工具建立并运行一个输入音频流记录样本。以下是我的意思链接：http://msdn.microsoft.com/en-us/library/windows/desktop/dd370800（v=vs.85）.aspx

这是相关代码：

#include "InputTest.h"
#include "Audioclient.h"
#include "Mmdeviceapi.h"
void InputTest::TakeInput()
{
HRESULT hr;
//Parameter variables for stream initialization
AUDCLNT_SHAREMODE ShareMode = AUDCLNT_SHAREMODE_SHARED;
DWORD da = 0;
REFERENCE_TIME bufferDuration = 10;
REFERENCE_TIME periodicity = 5;
WAVEFORMATEX pFormat;
LPCGUID AudioSessionGuid = NULL;
GUID guid2 = *AudioSessionGuid;
HRESULT guidError = UuidCreate(&guid2);  //could do some error checking here.    //project ->       properties -> Linker -> Command Line -> Rpctr4.lib
//guid2 now has a generated value
//give ASG the address of the newly generated guid2
AudioSessionGuid = &guid2;

//Instantiate WaveFormat
pFormat.wFormatTag = WAVE_FORMAT_PCM;
pFormat.cbSize = 10;  //extra information sent over stream. Usually ignored in PCM format.
//If wFormatTag is WAVE_FORMAT_PCM, nAvgBytesPerSec must equal nSamplesPerSec × nBlockAlign
pFormat.nAvgBytesPerSec = 0;
pFormat.nSamplesPerSec = 0;
pFormat.nBlockAlign = 0;
pFormat.nChannels = 2;
pFormat.wBitsPerSample = 16; //PCM standard
//Pointer for stored audio stream
IAudioClient *iac = NULL;
//Endpoint device selection
IMMDeviceEnumerator *pEnumerator = NULL;
IMMDevice *pDevice = NULL;
HRESULT de;
de = pEnumerator -> GetDefaultAudioEndpoint(eRender, eConsole, &pDevice);
hr = iac -> IAudioClient::Initialize(ShareMode, da, bufferDuration, periodicity, &pFormat, AudioSessionGuid);
}`

完整错误消息：

error LNK2019: unresolved external symbol "public: virtual long __stdcall
IAudioClient::Initialize(enum _AUDCLNT_SHAREMODE,unsigned long,__int64,__int64,struct 
tWAVEFORMATEX const *,struct _GUID const *)" (?
Initialize@IAudioClient@@UAGJW4_AUDCLNT_SHAREMODE@@K_J1PBUtWAVEFORMATEX@@PBU_GUID@@@Z) 
referenced in function "public: void __thiscall InputTest::TakeInput(void)" (?
TakeInput@InputTest@@QAEXXZ)

任何建议都非常感谢，因为我现在正在阅读一本很好的C++实践书。这个错误是怎么回事？

错误：

hr = iac -> IAudioClient::Initialize(...

正确：

hr = iac->Initialize(...

您应该在这里调用COM接口指针的虚拟方法，而不是绕过vtable的特定函数（有关讨论，请参阅此问题）。

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